It's the heavy flywheel. More mass = more rotational inertia. That's why lightweight flywheels are a somewhat popular mod for Zs. The 350 was the same way. Nissan chose a heavy flywheel out of noise considerations.
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"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.
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